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Título

Molecular-scale shear response of the organic semiconductor β -DBDCS (100) surface

AutorÁlvarez Asensio, María Isabel; Moreno-Ramírez, Jorge S.; Pimentel, Carlos CSIC ORCID CVN ; Casado, Santiago; Matta, Micaela; Gierschner, Johannes; Muccioli, Luca; Yoon, Seong-Jun; Varghese, Shinto; Park, Soo Young; Gnecco, Enrico; Pina, Carlos M. CSIC ORCID
Fecha de publicación13-sep-2017
EditorAmerican Physical Society
CitaciónPhysical Review - Section B - Condensed Matter 96(11): 115422 (2017)
ResumenIn this work we present friction-force microscopy (FFM) lattice-resolved images acquired on the (100) facet of the semiconductor organic oligomer ( 2 Z , 2 ′ Z ) − 3 , 3 ′ -(1,4-phenylene)bis(2-(4-butoxyphenyl)acrylonitrile) ( β -DBDCS) crystal in water at room temperature. Stick-slip contrast, lateral contact stiffness, and friction forces are found to depend strongly on the sliding direction due to the anisotropic packing of the molecular chains forming the crystal surface along the [010] and [001] directions. The anisotropy also causes the maximum value of the normal force applicable before wearing to increase by a factor of 3 when the scan is performed along the [001] direction on the (100) face. Altogether, our results contribute to achieving a better understanding of the molecular origin of friction anisotropy on soft crystalline surfaces, which has been often hypothesized but rarely investigated in the literature.
Versión del editorhttps://doi.org/10.1103/PhysRevB.96.115422
URIhttp://hdl.handle.net/10261/185547
DOI10.1103/PhysRevB.96.115422
ISSN2469-9950
E-ISSN2469-9969
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